2 yrs late to this post but i have the exact same problem with guitar and have no idea how to move past it or what exercises to do. to me if fells like i’m tripping over my own hands??? or like when someone’s speaking i have tendency to interrupt with my own thoughts on a matter before they finish the sentence they’re speaking. That but with my hands like i want to finish already so i try to cram it all out before my brain tells my hand to move.